Rotary pivoted hammer for crushers



ILAILQAME, I

E. B. CAMPBELL.

ROTARY PIVOTED HAMMER FOR CRUSHERS.

APPLICATION FILED JUNE 6, 1921.

Patented Mar. 21, 1922.

UNHEE rnranr cornice.

' EDWARD B. CAMPBELL, OI ST. LOUIS, MISSOURI, ASSIGNOR TO WILLIAMS PATENT GRUSHER & PULVERIZER COMPANY, OF ST. LOUIS, MISSOURI, A CORPORATION OE MISSOURI.

ROTARY PIVOTED HAMMER FOR CRUSHER'S.

JlALIlOALSE.

Application filed June 6, 1921.

To all whom it may concern:

Be it known that I, EDWARD B. CAMPBELL, a citizen of the United States, residing at St. Louis, State of Missouri, have invented certain new and useful Improvements in Rotary Pivoted Hammers for Crushers, of which the following is a specification.

This invention relates to certain new and useful improvements in rotary pivoted hammers for crushers, the peculiarities of which will be hereinafter described and claimed.

The main object'of my invention is to provide a. simple and efiective connection between a hard steel-such as cast manganese-head and a shank of soft steel making up a pivoted rotary hammer for use in crushers and pulverizers:

Secondly, to provide, such a' connection that' the hammer head under any loosening of the connection, will tend to wedge itself upon the shank:

Thirdly, to provide a shank narrower than the head and adapted to said head.

In other forms of built-up hammers the head is liable towork loose under heavy usage and depart from the firm connection first secured. In my hammer, any loosening that may occur will be corrected by the wedging action between the parts that will follow such loosening due to the eccentricity of my disc pin F with regard to the outer curved end of the hammers in their socket walls and thus automatically regain a firm engagement.

In the accompanying drawing on which like reference letters indicate corresponding parts, Fig. 1 represents a .side view of a hammer embodying my invention; Fig. 2, a plan view of the head; Fig. 3, an edge view of said hammer; and Fig. 4c a vertical sectional view on the line ma: of r' ig. l. The letter A designates a head preferably rectangular and much thinner than it is wide, as indicated in the figures; this head is of hard steel, preferably cast manganese steel, which is adapted for the operating ends of such pivoted hammers on the ac count of its hardness. In each side of said head is a semi-circular socket open at the bottom edge and leaving a central rib B in the plane of rotation Y indicated by the arrow Fig. 1. The upper wall of each socket Specification of Letters Patent.

Patented Mar. 21, 1922. Serial No. 475,480.

is semi-circular and indicated by the letter C, being struck from a point in the central line X with a radius D. The side walls of the sockets are straight at E to the open bottom edge. Projecting laterally from the central rib is a disc pin F in each socket, each pin alined with the opposite pin, and the transverse axis of said pins located eccentric to the upper semi-circular wall C of each socket. ThlS is to say, the center line .Z of the disc pins passes through the center line XX at a point below the point from which the semi-circular walls C are struck by the radius D. The amount of this eccentricity is indicated in Fig. 1 by the dashed semi-circle on the radius G from the axis of the disc pins F. A lune is formed by this eccentric location of the disc pins so that any loosening of connection between the double shank formed by the two pieces H and H fitting in said sockets, will cause a wedging action between the semi-circular walls and the matching semi-circular ends of said shank parts. The upper ends of the twopart shank have holes matching the said disc pins. and the lower ends are also provided with matching holes for pivotal mounting. These two parts are symmetrical and the lower portions lie close together, while the upper ends are divided a distance equal to the thickness of the rib B by means of curved or bent portions I just below the head when mounted in the sockets. The thickness of the parts forming the shank is such that the double shank is narrower than the head as shown in Fig. 3.

A. suitable means for securing the upper ends of the shank parts in said sockets may be employed, but I prefer rivets R passing through the shank parts transversely and countersunk at the ends, and preferably located in the upper ends of the double shank at a point about 4:5 each side of the center line X as shown in Fig. 1. These rivets assist, when located as shown, the wedging action of the head and shank in maintaining a firm connection.

Thus it is evident that a suitable head of hard steel can be formed, and soft steel shanks bent and stamped and punched to fit said head may be secured in a firm connection, which connection under usage will tend to maintain itself by wedging action in spite of any loosening that may occur between the connected parts.

I claim:

1. A rotary pivoted hammer comprising a head having a lateral socket on each side ofa central rib in the plane of rotation,- each socket having a semi-circular outer wall and a disc pin laterally projecting from I lower end for pivotal mounting I a head having a lateral socket on each side of a central rib in the plane of rotation,-- each socket having a semi-circular upper wall and an integral disc pin laterally projecting from the said rib and eccentric to said upper wall, a double shank consisting of two parts fitting closely together and adapted for pivotal mounting at their lower ends and having semi-circular upper 'ends and holes matching said socket walls and disc pins respectively, and bent outward at their upper ends dividing them a distance equal to the thickness of said rib and adapted to fit snugly into said sockets, and means to hold said upper ends in said sockets.

3. A rotary pivoted hammer. comprising a flat rectangular manganese steel head having lateral sockets with semi-circular upper walls on opposite sides of a central rib in the plane of rotation,each socket having an integral lateral disc pin alined with the other pin and eccentric to said upper cylindrical walls, and a soft steel shank having divided semi-circular ends and alined holes fitting said socket walls and alined disc pins respectively, and adapted for pivotal mounting at the other end, and rivets passing through said double shankand maintaining the divided ends in said sockets.

In testimony whereof I have aifixed my signature.

EDWARD B. CAMPBELL. 

